Spring smog warning as London breaches particulate limit early

A series of recent air pollution episodes, culminating in the first smog warning for two years, has lead to an early breach of particulate limits in central London

London skyline during the Easter weekend smog, 2011 (credit: Gareth Simkins)The UK’s air quality policies have come under attack again after an official smog warning was issued on 21 April. The last warning was in June 2009.

High atmospheric pressure, bringing warm and still conditions to England and Wales, caused the smog. Ozone reached an eight-hour average of 163 micrograms per cubic metre in North Yorkshire the next day, 43µg/m3 over the long-term objective.

Please sign in or register to continue.

Sign in to continue reading

Having trouble signing in?

Contact Customer Support at
or call 020 8267 8120

Subscribe for full access

or Register for limited access

Already subscribe but don't have a password?
Activate your web account here